That's totally not true. I design high end sound isolated home theaters that are built for the room. They r built from the ground up so they r totally isolated from the house. They are designed for acoustics by a certified acoustics expert. They are also then calibrated for each seat in the room by certified individuals. The quality we r able to accomplish blows away most commercial theatre cause our rooms are built in a smaller scale and can give each seat the same picture and sound quality which is not possible in a huge theatre. It's all about the design of the room not the equipment. The equipment is picked to match the room.
The picture in the rooms I design even in a non isolated room blows away most out there cause of our calibrators.
I don't even go to movie theaters anymore. I wait for everything to come out on disk. Every person who has been in my room or one we built said they will never go back to a commercial theatre. You have to remember you don't need a screen as large as a commercial space. As long as the viewing angles and distances are set for the screen the experience you see is the same. Same with sound.